So so so happy about the "no ads" part and do really hope there is a paid option to keep no ads forever. And hopefully the paid subscriptions keep the ads off the free plans for this who aren't as privileged to pay for it.
Originally Netflix was a single tier at $9.99 with no ads. As ZIRP ended and investors told Netflix its VC-like honeymoon period was over - ads were introduced at $6.99 and the basic no ad tier went to $15.99 and the Premium went to 19.99.
Currently Netflix ad supported is $7.99, add free is $17.99 and Premium is $24.99.
Mapping that on to OpenAI pricing - ChatGPT will be ~$17.99 for ad supported, ~$49.99 for ad free and ~$599 for Pro.